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/*
net-disconnect.c :
Copyright (C) 1999-2000 Timo Sirainen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "module.h"
#include "network.h"
/* when quitting, wait for max. 5 seconds before forcing to close the socket */
#define MAX_QUIT_CLOSE_WAIT 5
/* wait for max. 2 minutes for other side to close the socket */
#define MAX_CLOSE_WAIT (60*2)
typedef struct {
time_t created;
GIOChannel *handle;
int tag;
} NET_DISCONNECT_REC;
static GSList *disconnects;
static int timeout_tag;
static void net_disconnect_remove(NET_DISCONNECT_REC *rec)
{
disconnects = g_slist_remove(disconnects, rec);
g_source_remove(rec->tag);
net_disconnect(rec->handle);
g_free(rec);
}
static void sig_disconnect(NET_DISCONNECT_REC *rec)
{
char buf[512];
int count, ret;
/* check if there's any data waiting in socket. read max. 5kB so
if server just keeps sending us stuff we won't get stuck */
count = 0;
do {
ret = net_receive(rec->handle, buf, sizeof(buf));
if (ret == -1) {
/* socket was closed */
net_disconnect_remove(rec);
}
count++;
} while (ret == sizeof(buf) && count < 10);
}
static int sig_timeout_disconnect(void)
{
NET_DISCONNECT_REC *rec;
GSList *tmp, *next;
time_t now;
/* check if we've waited enough for sockets to close themselves */
now = time(NULL);
for (tmp = disconnects; tmp != NULL; tmp = next) {
rec = tmp->data;
next = tmp->next;
if (rec->created+MAX_CLOSE_WAIT <= now)
net_disconnect_remove(rec);
}
if (disconnects == NULL) {
/* no more sockets in disconnect queue, stop calling this
function */
timeout_tag = -1;
}
return disconnects != NULL;
}
/* Try to let the other side close the connection, if it still isn't
disconnected after certain amount of time, close it ourself */
void net_disconnect_later(GIOChannel *handle)
{
NET_DISCONNECT_REC *rec;
rec = g_new(NET_DISCONNECT_REC, 1);
rec->created = time(NULL);
rec->handle = handle;
rec->tag = g_input_add(handle, G_INPUT_READ,
(GInputFunction) sig_disconnect, rec);
if (timeout_tag == -1) {
timeout_tag = g_timeout_add(10000, (GSourceFunc)
sig_timeout_disconnect, NULL);
}
disconnects = g_slist_append(disconnects, rec);
}
void net_disconnect_init(void)
{
disconnects = NULL;
timeout_tag = -1;
}
void net_disconnect_deinit(void)
{
NET_DISCONNECT_REC *rec;
time_t now, max;
int first, fd;
struct timeval tv;
fd_set set;
/* give the sockets a chance to disconnect themselves.. */
max = time(NULL)+MAX_QUIT_CLOSE_WAIT;
first = 1;
while (disconnects != NULL) {
rec = disconnects->data;
now = time(NULL);
if (rec->created+MAX_QUIT_CLOSE_WAIT <= now || max <= now) {
/* this one has waited enough */
net_disconnect_remove(rec);
continue;
}
fd = g_io_channel_unix_get_fd(rec->handle);
FD_ZERO(&set);
FD_SET(fd, &set);
tv.tv_sec = first ? 0 : max-now;
tv.tv_usec = first ? 100000 : 0;
if (select(fd+1, &set, NULL, NULL, &tv) > 0 &&
FD_ISSET(fd, &set)) {
/* data coming .. check if we can close the handle */
sig_disconnect(rec);
} else if (first) {
/* Display the text when we have already waited
for a while */
printf("Please wait, waiting for servers to close "
"connections..\n");
fflush(stdout);
first = 0;
}
}
}
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